Malicious PDF — malware analysis report

Static analysis result for SHA-256 669c4f2e8cd161da…

MALICIOUS

PDF

113.8 KB Created: 2021-09-11 00:59:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: edbf3f1313a279c30984824788877e9e SHA-1: 8eea75d3b5fdc80fa027d14aabc8f87982314648 SHA-256: 669c4f2e8cd161da4b93f5c54f780622f365a9f31c9c507ba8727cf4084c61f9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of a 'download button' heuristic and numerous links to external PDF files, some hosted on compromised CMS uploads or disposable domains, suggests a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.jokilaaksonratsastajat.fi/file/tivubowalewizabewapuma.pdf In PDF document text
    • http://ingpiazza.eu/userfiles/files/bazexorudozopeki.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/44303940586.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/86581345063.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/47572658681.pdfIn PDF document text
    • http://peter-crooks.com/userfiles/file/suxatosiwakigefuvera.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/gumikosekeno.pdfIn PDF document text
    • http://sake-tori.com/images/library/File/fiwuzepigev.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/32842329570.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/32781099278.pdfIn PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72820767790.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/35174517294.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/952162f3a961b8759ba609d49bc20e8b/67046612839.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132370a39169---58743945989.pdfIn PDF document text
    • https://jobtiara.com/files/files/17866710576.pdfIn PDF document text
    • http://peoplefineart.com/assets/202109/files/20210908070433231567.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/23076644887.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b4735234e---sizuwirobitevukasopev.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/77920965420.pdfIn PDF document text
    • http://thucancakoihikari.com/luutru/files/56546711011.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/jipapuzel.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161366bcecd735---lafafo.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/95553774255.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=fifty+shades+of+gray+full+movie+123moviesPDF link annotation
    • https://easyown.ddproperty.com/datas/files/70761260992.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014a12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A12 11300 bytes
SHA-256: 621c217fc659f287ded7b6ed4be6707efdab17ba21dc6fc695aaf9d2390d7ef1
font_01_sfnt_off0001648e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1648E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017ca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17CA0 23412 bytes
SHA-256: 52bdb9f569f46fb909c573219cdb0df9ad3be97b456dce4b4c01ec6a0b093aae